CN110653345B - Sand core assembly and method for forming sand core assembly through 3D printing - Google Patents

Sand core assembly and method for forming sand core assembly through 3D printing Download PDF

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Publication number
CN110653345B
CN110653345B CN201810702895.1A CN201810702895A CN110653345B CN 110653345 B CN110653345 B CN 110653345B CN 201810702895 A CN201810702895 A CN 201810702895A CN 110653345 B CN110653345 B CN 110653345B
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CN
China
Prior art keywords
runner
cavity
communication
core assembly
sand core
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CN201810702895.1A
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Chinese (zh)
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CN110653345A (en
Inventor
林江波
黄成水
刘三祥
纪小坤
布龙·迈克尔
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Danfoss Tianjin Ltd
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Danfoss Tianjin Ltd
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Priority to CN201810702895.1A priority Critical patent/CN110653345B/en
Priority to FR1906164A priority patent/FR3083150B1/en
Priority to US16/449,593 priority patent/US10906091B2/en
Publication of CN110653345A publication Critical patent/CN110653345A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/103—Multipart cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/082—Sprues, pouring cups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

Embodiments of the present invention disclose a sand core assembly for casting a part and a method of forming a sand core assembly for casting a part by 3D printing, the sand core assembly comprising: an upper portion and a lower portion; a cavity defined by an upper portion and a lower portion; an upper sprue located in the upper portion; a lower sprue located in the lower portion and in communication with the upper sprue; an upper runner located in the upper portion, spaced a predetermined distance from the upper sprue, and in communication with the cavity; and a lower runner in the lower portion in communication with the lower sprue and spaced from the cavity in the lower portion, a first end of the lower runner in communication with the lower sprue and a second end of the lower runner in communication with the upper runner. With the sand core assembly for casting parts according to the embodiment of the invention, for example, the production cost can be reduced.

Description

Sand core assembly and method for forming sand core assembly through 3D printing
Technical Field
The present invention relates to the field of casting technology, and more particularly, to a sand core assembly for casting a part and a method of forming the sand core assembly by 3D printing.
Background
The compression part is an important component of the scroll compressor and is generally composed of a fixed scroll and a movable scroll which are assembled together in a staggered way, and the compression part has a complex structure and high manufacturing process precision. Compression elements have traditionally been manufactured from cast iron or the like by casting the sand core. The traditional core making technology adopts a die to make the sand core, the parting surface, the exhaust structure and the like are required to be designed in advance, and if the product structure needs to be modified, the die is required to be modified first, and then the sand core can be made. The continuous modification of the mold makes the whole casting cycle prolonged, and it is difficult to ensure the molding requirement for the sand core of the compression part with complex casting structure.
Disclosure of Invention
It is an object of embodiments of the present invention to provide a sand core assembly for casting components such as a fixed scroll and an orbiting scroll and a method of forming a sand core assembly by 3D printing, whereby production costs may be reduced, for example.
Embodiments of the present invention provide a sand core assembly for casting a component, the sand core assembly comprising: an upper portion and a lower portion; a cavity defined by an upper portion and a lower portion; an upper sprue located in the upper portion; a lower sprue located in the lower portion and in communication with the upper sprue; an upper runner in the upper portion spaced a predetermined distance from the upper sprue and in communication with the cavity; and a lower runner in the lower portion in communication with the lower sprue and spaced from the cavity in the lower portion, wherein a first end of the lower runner is in communication with the lower sprue and a second end of the lower runner is in communication with the upper runner.
According to an embodiment of the present invention, the sand core assembly for casting a component further comprises: a plurality of through holes in each of the upper and lower portions; a bolt passing through the through hole; and a nut engaged with the threaded portion of the bolt.
According to an embodiment of the invention, a plurality of through holes in each of the upper and lower portions are arranged around the cavity.
According to an embodiment of the invention, the depth of the lower sprue is greater than the depth of the lower runner.
According to an embodiment of the invention, the upper runner comprises a first upper runner and a second upper runner in communication with the cavity, respectively, and the lower runner comprises a first lower runner and a second lower runner, a first end of the first lower runner being in communication with the lower sprue and a second end of the first lower runner being in communication with the first upper runner, a first end of the second lower runner being in communication with the lower sprue and a second end of the second lower runner being in communication with the second upper runner.
According to an embodiment of the present invention, the sand core assembly for casting a component further comprises: and a riser defined by an upper portion and a lower portion and communicating with the cavity, the second upper runner communicating with the riser, and the riser being connected to the second upper runner at a location further from the upper sprue than the cavity is connected to the second upper runner.
According to an embodiment of the invention, the first upper runner communicates with the cavity through a first communication runner, and the second upper runner communicates with the cavity through a second communication runner.
According to an embodiment of the invention, the first upper runner communicates with the cavity through a first communication runner, and the second upper runner communicates with the cavity through a second communication runner and with the riser through a third communication runner.
According to an embodiment of the invention, each of the first upper runner and the second upper runner has two ends and an intermediate portion between the two ends, the intermediate portion of the first upper runner being connected to the first communicating runner and the intermediate portion of the second upper runner being connected to the second communicating runner.
According to an embodiment of the present invention, each of the first upper runner and the second upper runner has two ends and an intermediate portion between the two ends, the intermediate portion of the first upper runner is connected to the first communication runner, and the intermediate portion of the second upper runner is connected to the second communication runner and the third communication runner.
According to an embodiment of the present invention, the sand core assembly for casting a component further comprises: one or more vent holes provided in the upper portion, extending upwardly from the cavity and/or the riser, and penetrating to an upper surface of the upper portion.
According to an embodiment of the invention, the component is a compression component of a scroll compressor having an end plate and a scroll wrap extending from the end plate, the cavity portion of the cavity for forming the end plate being disposed generally horizontally.
According to an embodiment of the invention, at least a part of a cavity portion of the cavity for forming the end plate is provided in the upper portion.
According to an embodiment of the invention, the cavity portion of the cavity for forming the end plate comprises a first portion and a second portion, which are arranged in the upper portion and the lower portion, respectively.
According to an embodiment of the invention, the upper runner and the lower runner have a cross-section of isosceles trapezoid.
According to an embodiment of the present invention, the sand core assembly for casting a component further comprises: and the pouring cup is positioned in the upper part, and the upper sprue is communicated with the pouring cup.
According to an embodiment of the invention, the upper runner is an upper recess provided in the bottom of the upper portion, the lower runner is a lower recess provided in the top of the lower portion, and the second end of the lower runner overlaps at least partially with an end of the upper runner when viewed in a vertical direction.
According to an embodiment of the invention, the upper and lower portions of the sand core assembly are each formed in one piece by 3D printing techniques.
Embodiments of the present invention also provide a method of forming a sand core assembly for casting a component by 3D printing, the method comprising the steps of: forming an upper portion by 3D printing to form an upper cavity portion, an upper sprue, an upper runner spaced a predetermined distance from the upper sprue and communicating with the upper cavity portion; forming a lower portion by 3D printing to form a lower cavity portion, a lower sprue, a lower runner in communication with the lower sprue and spaced apart from the lower cavity; and assembling the upper and lower portions together such that a cavity is formed by an upper cavity portion and a lower cavity portion, the lower sprue being in communication with the upper sprue, and a first end of the lower runner being in communication with the lower sprue, and a second end of the lower runner being in communication with the upper runner.
According to an embodiment of the invention, the depth of the lower sprue is greater than the depth of the lower runner.
According to an embodiment of the invention, the upper runner comprises a first upper runner and a second upper runner in communication with the cavity, respectively, and the lower runner comprises a first lower runner and a second lower runner, a first end of the first lower runner in communication with the lower sprue and a second end of the first lower runner in communication with the first upper runner, a first end of the second lower runner in communication with the lower sprue and a second end of the second lower runner in communication with the second upper runner.
According to an embodiment of the present invention, the step of forming the upper portion by 3D printing further forms an upper riser portion; the step of forming the lower portion by 3D printing also forms a lower riser portion; and the upper riser part and the lower riser part form a riser, the riser is communicated with the cavity, the second upper runner is communicated with the riser, and the connection position of the riser and the second upper runner is far away from the upper sprue than the connection position of the cavity and the second upper runner.
According to an embodiment of the invention, the first upper runner communicates with the cavity through a first communication runner, and the second upper runner communicates with the cavity through a second communication runner.
According to an embodiment of the invention, the first upper runner communicates with the cavity through a first communication runner, and the second upper runner communicates with the cavity through a second communication runner and with the riser through a third communication runner.
According to an embodiment of the invention, each of the first upper runner and the second upper runner has two ends and an intermediate portion therebetween, the intermediate portion of the first upper runner being connected to the first communicating runner and the intermediate portion of the second upper runner being connected to the second communicating runner.
According to an embodiment of the present invention, each of the first upper runner and the second upper runner has two ends and an intermediate portion therebetween, the intermediate portion of the first upper runner is connected to the first communicating runner, and the intermediate portion of the second upper runner is connected to the second communicating runner and the third communicating runner.
According to an embodiment of the invention, the step of forming the upper portion by 3D printing further forms one or more vent holes extending upwardly from the cavity and/or the riser and through to an upper surface of the upper portion.
According to an embodiment of the invention, the upper runner is an upper recess provided in the bottom of the upper portion, the lower runner is a lower recess provided in the top of the lower portion, and the second end of the lower runner at least partially overlaps the end of the upper runner when viewed in a vertical direction.
According to an embodiment of the invention, forming the upper portion by 3D printing further comprises forming a plurality of through holes in the upper portion, and forming the lower portion by 3D printing further comprises forming a plurality of through holes in the lower portion.
According to an embodiment of the present invention, the plurality of through holes in the upper portion and the plurality of through holes in the lower portion are each formed to be arranged around the cavity.
With the sand core assembly for casting a component and the method of forming the sand core assembly by 3D printing according to the embodiments of the present invention, for example, production costs can be reduced.
Drawings
FIG. 1 is a schematic perspective view of an upper portion of a sand core assembly for casting components according to an embodiment of the present invention;
FIG. 2 is another schematic perspective view of an upper portion of a sand core assembly for casting a component according to an embodiment of the present invention;
FIG. 3 is a schematic bottom view of an upper portion of a sand core assembly for casting components according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of an upper portion of a sand core assembly for casting a component according to an embodiment of the present invention taken along line AA in FIG. 3;
FIG. 5 is a schematic top view of an upper portion of a sand core assembly for casting a component according to an embodiment of the present invention;
FIG. 6 is a schematic perspective view of a lower portion of a sand core assembly for casting a component according to an embodiment of the present invention;
FIG. 7 is another schematic perspective view of a lower portion of a sand core assembly for casting a component according to an embodiment of the present invention;
FIG. 8 is a schematic top view of a lower portion of a sand core assembly for casting a component according to an embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view of a lower portion of a sand core assembly for casting a component according to an embodiment of the present invention taken along line BB in FIG. 8; and
Fig. 10 is a schematic bottom view of a lower portion of a sand core assembly for casting components according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described below with reference to the accompanying drawings.
Referring to fig. 1 to 10, a sand core assembly for casting a component according to an embodiment of the present invention includes an upper part 1 and a lower part 2 (an upper sand core 1 and a lower sand core 2); a cavity 3 defined by an upper portion 1 and a lower portion 2; a pouring cup 11 located in the upper part 1; an upper sprue 12 located in the upper portion 1 and communicating with the tundish 11; a lower sprue 22 located in the lower portion 2 and communicating with the upper sprue 12; an upper runner 13 located in the upper portion 1 at a predetermined distance from the upper sprue 12 and communicating with the cavity 3; and a lower runner 23 located in the lower portion 2 in communication with the lower sprue 22 and spaced from the cavity 3 in the lower portion 2. The first end of the lower runner 23 communicates with the lower sprue 22 and the second end of the lower runner 23 communicates with the upper runner 13. The upper runner 13 and the lower runner 23 may have a cross section of an isosceles trapezoid. The pouring cup 11 may be cylindrical in shape, conical or other. The cross-sections of the upper sprue 12 and the lower sprue 22 may be circular, square, or may be elliptical or the like. Both the upper part 1 and the lower part 2 may be formed in one piece by means of 3D printing, i.e. using additive manufacturing methods. The upper and lower portions 1, 2 have a horizontal parting line or parting plane. The upper runner 13 is an upper recess provided in the bottom of the upper portion 1, the lower runner 23 is a lower recess provided in the top of the lower portion 2, and the second end of the lower runner 23 overlaps at least partially, e.g. completely, with the end of the upper runner 13 when viewed in a vertical direction (i.e. from top to bottom in a direction perpendicular to the surface of the upper portion 1). Further, the upper runner 13 may be a hole provided in the upper portion 1, the lower runner 23 may be a hole provided in the lower portion 2, and the upper runner 13 and the lower runner 23 may communicate through additional holes. The upper and lower runners 12, 22 may extend generally vertically or be inclined at an angle, e.g., less than 30 degrees, relative to vertical, and the upper and lower runners 13, 23 may be disposed generally horizontally or be inclined upwardly or downwardly at an angle, e.g., less than 30 degrees, relative to horizontal.
Referring to fig. 1, 2, 3, 5, 6, 7, 8, 10, according to an embodiment of the present invention, the sand core assembly further comprises: a plurality of through holes 5 in each of the upper and lower portions 1 and 2; bolts passing through the through holes 5; a nut engaged with the threaded portion of the bolt; and washers provided between one of the upper and lower parts 1 and 2 and the head of the bolt and between the other of the upper and lower parts 1 and 2 and the nut. A plurality of through holes 5 may be arranged around the cavity 3. By means of the bolts, the upper part 1 and the lower part 2 can be fixed together, preventing a change in the relative position between the upper part 1 and the lower part 2 during casting.
Referring to fig. 7 and 8, the depth of the lower sprue 22 is greater than the depth of the lower runner 23 in accordance with an embodiment of the present invention. Alternatively, the depth of the lower sprue 22 may be approximately equal to the depth of the lower runner 23.
Referring to fig. 2, 3, 7, 8, according to an embodiment of the present invention, the upper runner 13 includes a first upper runner 131 and a second upper runner 132 in communication with the cavity 3, respectively, and the lower runner 23 includes a first lower runner 231 and a second lower runner 232, a first end of the first lower runner 231 being in communication with the lower sprue 22, and a second end of the first lower runner 231 being in communication with the first upper runner 131, a first end of the second lower runner 232 being in communication with the lower sprue 22, and a second end of the second lower runner 232 being in communication with the second upper runner 132. Alternatively, the upper runner 13 may include only one upper runner, or three or more upper runners, and the lower runner 23 may include one lower runner, or three or more lower runners.
Referring to fig. 2, 3, 7, 8, according to an embodiment of the present invention, the sand core assembly further includes: riser 8, riser 8 is defined by upper portion 1 and lower portion 2 and communicates with cavity 3, second upper runner 132 communicates with riser 8, and riser 8 is connected to second upper runner 132 at a position further away from upper sprue 12 than the position of connection of cavity 3 to second upper runner 132. According to one example of the invention, the first upper runner 131 communicates with the cavity 3 through a first communication runner 141 and the second upper runner 132 communicates with the cavity 3 through a second communication runner 142. According to another example of the invention, the first upper runner 131 communicates with the cavity 3 through a first communication runner 141, and the second upper runner 132 communicates with the cavity 3 through a second communication runner 142 and with the riser 8 through a third communication runner 143. According to one example of the present invention, each of the first upper runner 131 and the second upper runner 132 has two ends and an intermediate portion therebetween, the intermediate portion of the first upper runner 131 is connected to the first communicating runner 141, and the intermediate portion of the second upper runner 132 is connected to the second communicating runner 142. According to another example of the present invention, each of the first upper runner 131 and the second upper runner 132 has two ends and an intermediate portion therebetween, the intermediate portion of the first upper runner 131 is connected to the first communicating runner 141, and the intermediate portion of the second upper runner 132 is connected to the second communicating runner 142 and the third communicating runner 143. The shape of the riser 8 may be spherical, cylindrical or other suitable shape. Riser 8 may be exothermic, insulated or a conventional riser.
Referring to fig. 7 and 8, according to an embodiment of the present invention, the sand core assembly further includes: a filter element (not shown) is provided in the intersection of the lower sprue 22 and the upper runner 13. The filter element may be a honeycomb filter or a filter sheet for filtering impurities during casting.
Referring to fig. 1 to 10, according to an embodiment of the present invention, the cast member is a compression member of a scroll compressor having an end plate and a scroll wrap protruding from the end plate, and a cavity portion of the cavity 3 for forming the end plate is disposed substantially horizontally. At least a part of the cavity portion of the cavity 3 for forming the end plate is provided in the upper part 1. According to the embodiment shown in the figures, the cavity portion of the cavity 3 for forming the end plate comprises a first portion and a second portion, which are arranged in the upper part 1 and the lower part 2, respectively.
Although the core assembly includes the upper portion 1 and the lower portion 2 in the above embodiments, the core assembly may include more portions.
According to an embodiment of the invention, see fig. 1,2, the sand core assembly further comprises one or more exhaust holes 6 provided in the upper part 1 for exhausting gas from the sand core cavity during casting. The one or more vent holes 6 extend upwardly from the cavity 3 and/or riser 8 and extend through to the upper surface of the upper portion 1. Furthermore, the side of the upper part 1 is provided with one or more recesses 7 for handling the upper part and for assembling the upper part. Furthermore, the side of the lower part 2 may also be provided with one or more grooves for handling the lower part and for fitting the lower part. In addition, the surfaces constituting the cavity 3 may be coated with a paint for improving the roughness of the casting surface.
Referring to fig. 1 through 10, a method of forming a sand core assembly for casting a part by 3D printing is provided according to an embodiment of the present invention, which may be used to form the sand core assembly in the above-described embodiments. A method of forming a sand core assembly for casting a part by 3D printing according to an embodiment of the present invention includes the steps of: forming the upper part 1 by 3D printing to form an upper cavity portion 31, an upper sprue 12, an upper runner 13 spaced a predetermined distance from the upper sprue 12 and communicating with the upper cavity portion 31; forming the lower portion 2 by 3D printing to form a lower cavity portion 32, a lower sprue 22, a lower runner 23 in communication with the lower sprue 22 and spaced from the lower cavity portion 32; and assembling the upper part 1 and the lower part 2 together such that the cavity 3 is constituted by the upper cavity part 31 and the lower cavity part 32. The lower sprue 22 communicates with the upper sprue 12 and a first end of the lower runner 23 communicates with the lower sprue 22 and a second end of the lower runner 23 communicates with the upper runner 13.
Referring to fig. 2,3, 7, 8, the step of forming the upper portion 1 by 3D printing also forms an upper riser portion 81 according to an embodiment of the present invention; the step of forming the lower portion 2 by 3D printing also forms a lower riser portion 82; and the upper riser portion 81 and the lower riser portion 82 constitute a riser 8, the riser 8 communicates with the cavity 3, the second upper runner 13 communicates with the riser 8, and the connection position of the riser 8 and the second upper runner 13 is further away from the upper sprue 12 than the connection position of the cavity 3 and the second upper runner 13.
According to an embodiment of the invention, referring to fig. 1,2, the step of forming the upper part 1 by 3D printing also forms one or more vent holes 6, the one or more vent holes 6 extending upwardly from the mould cavity 3 and/or riser 8 and penetrating the upper surface of the upper part 1.
According to an embodiment of the invention, referring to fig. 1,2,3, 5,6, 7, 8, 10, forming the upper part 1 by 3D printing further comprises forming a plurality of through holes 5 in the upper part 1, and forming the lower part 2 by 3D printing further comprises forming a plurality of through holes 5 in the lower part 2. According to an embodiment of the present invention, the plurality of through holes 5 in the upper portion 1 and the plurality of through holes 5 in the lower portion 2 are each formed to be arranged around the cavity 3.
The structure of the sand core assembly formed by the method according to the embodiment of the present invention may be the same as that of the sand core assembly in the above-described embodiment.
The sand core assembly according to embodiments of the present invention may be applied to gravity casting and is applicable to any cast component.

Claims (27)

1. A sand core assembly for casting a component comprising:
An upper portion and a lower portion;
a cavity defined by the upper portion and the lower portion;
A pouring cup;
An upper sprue located in the upper portion;
a lower sprue located in the lower portion and in communication with the upper sprue;
an upper runner in the upper portion spaced a predetermined distance from the upper sprue and in communication with the cavity; and
A lower runner in the lower portion in communication with the lower sprue and spaced from the cavity in the lower portion,
Wherein a first end of the lower runner communicates with the lower sprue and a second end of the lower runner communicates with the upper runner;
Wherein the component is a compression component of a scroll compressor having an end plate and a scroll wrap extending from the end plate, a cavity portion of the cavity for forming the end plate being disposed generally horizontally;
wherein at least a portion of the cavity for forming the end plate is disposed in the upper portion; and
Wherein the cavity portion of the cavity for forming the end plate comprises a first portion and a second portion, the first portion and the second portion being disposed in the upper portion and the lower portion, respectively.
2. The sand core assembly for casting a component as recited in claim 1 further comprising:
a plurality of through holes in each of the upper and lower portions;
A bolt passing through the through hole; and
And a nut engaged with the threaded portion of the bolt.
3. The sand core assembly for casting a component of claim 2 wherein:
The plurality of through holes in each of the upper portion and the lower portion are arranged around the cavity.
4. The sand core assembly for casting a component of claim 1 wherein:
The depth of the lower sprue is greater than the depth of the lower runner.
5. The sand core assembly for casting a component of claim 1 wherein:
the upper runner comprises a first upper runner and a second upper runner which are respectively communicated with the cavity, and
The lower runner includes a first lower runner and a second lower runner, a first end of the first lower runner is in communication with the lower sprue, and a second end of the first lower runner is in communication with the first upper runner, a first end of the second lower runner is in communication with the lower sprue, and a second end of the second lower runner is in communication with the second upper runner.
6. The sand core assembly for casting a component as recited in claim 5 further comprising:
a riser defined by the upper portion and the lower portion and in communication with the cavity, the second upper runner in communication with the riser, and the riser being connected to the second upper runner at a location further from the upper sprue than the cavity is connected to the second upper runner.
7. The sand core assembly for casting a component as recited in claim 5 wherein:
the first upper runner communicates with the cavity through a first communication runner, and the second upper runner communicates with the cavity through a second communication runner.
8. The sand core assembly for casting a component as recited in claim 6 wherein:
The first upper runner communicates with the cavity through a first communication runner, and the second upper runner communicates with the cavity through a second communication runner and communicates with the riser through a third communication runner.
9. The sand core assembly for casting a component as recited in claim 7 wherein:
Each of the first upper runner and the second upper runner has two ends and an intermediate portion therebetween, the intermediate portion of the first upper runner is connected with the first communication runner, and the intermediate portion of the second upper runner is connected with the second communication runner.
10. The sand core assembly for casting a component as recited in claim 8 wherein:
Each of the first upper runner and the second upper runner has two ends and an intermediate portion therebetween, the intermediate portion of the first upper runner is connected with the first communication runner, and the intermediate portion of the second upper runner is connected with the second communication runner and the third communication runner.
11. The sand core assembly for casting a component as recited in claim 10 further comprising:
One or more vent holes provided in the upper portion, extending upwardly from the cavity and/or the riser, and penetrating to an upper surface of the upper portion.
12. The sand core assembly for casting a component of claim 1 wherein:
the upper runner and the lower runner have isosceles trapezoid cross sections.
13. The sand core assembly for casting a component of claim 1 wherein:
The pouring cup is located in the upper portion, and the upper sprue is communicated with the pouring cup.
14. The sand core assembly for casting a component of claim 1 wherein:
The upper runner is an upper recess provided in a bottom of the upper portion, the lower runner is a lower recess provided in a top of the lower portion, and a second end of the lower runner at least partially overlaps an end of the upper runner when viewed in a vertical direction.
15. The sand core assembly for casting a component of any one of claims 1-14, wherein:
the upper portion and the lower portion of the sand core assembly are both formed in one step by 3D printing techniques.
16. A method of forming a sand core assembly for casting a part by 3D printing, comprising the steps of:
Forming an upper portion by 3D printing to form an upper cavity portion, an upper sprue, an upper runner spaced a predetermined distance from the upper sprue and communicating with the upper cavity portion;
Forming a lower portion by 3D printing to form a lower cavity portion, a lower sprue, a lower runner in communication with the lower sprue and spaced apart from the lower cavity portion; and
Assembling the upper and lower parts together such that a cavity is formed by the upper and lower cavity parts,
Wherein the lower sprue communicates with the upper sprue and a first end of the lower runner communicates with the lower sprue and a second end of the lower runner communicates with the upper runner;
Wherein the component is a compression component of a scroll compressor having an end plate and a scroll wrap extending from the end plate, a cavity portion of the cavity for forming the end plate being disposed generally horizontally;
wherein at least a portion of the cavity for forming the end plate is disposed in the upper portion; and
Wherein the cavity portion of the cavity for forming the end plate comprises a first portion and a second portion, the first portion and the second portion being disposed in the upper portion and the lower portion, respectively.
17. The method of forming a sand core assembly for a cast component through 3D printing according to claim 16 wherein:
The depth of the lower sprue is greater than the depth of the lower runner.
18. The method of forming a sand core assembly for a cast component through 3D printing according to claim 16 wherein:
the upper runner comprises a first upper runner and a second upper runner which are respectively communicated with the cavity, and
The lower runner includes a first lower runner and a second lower runner, a first end of the first lower runner is in communication with the lower sprue, and a second end of the first lower runner is in communication with the first upper runner, a first end of the second lower runner is in communication with the lower sprue, and a second end of the second lower runner is in communication with the second upper runner.
19. The method of forming a sand core assembly for a cast component through 3D printing as recited in claim 18 wherein:
The step of forming the upper portion by 3D printing also forms an upper riser portion;
the step of forming the lower portion by 3D printing also forms a lower riser portion; and
The upper riser portion and the lower riser portion form a riser, the riser is in communication with the cavity, the second upper runner is in communication with the riser, and a connection location of the riser and the second upper runner is further away from the upper sprue than a connection location of the cavity and the second upper runner.
20. The method of forming a sand core assembly for a cast component through 3D printing as recited in claim 18 wherein:
the first upper runner communicates with the cavity through a first communication runner, and the second upper runner communicates with the cavity through a second communication runner.
21. The method of forming a sand core assembly for a cast component through 3D printing as recited in claim 19 wherein:
The first upper runner communicates with the cavity through a first communication runner, and the second upper runner communicates with the cavity through a second communication runner and communicates with the riser through a third communication runner.
22. The method of forming a sand core assembly for a cast component through 3D printing according to claim 20 wherein:
Each of the first upper runner and the second upper runner has two ends and an intermediate portion therebetween, the intermediate portion of the first upper runner is connected with the first communication runner, and the intermediate portion of the second upper runner is connected with the second communication runner.
23. The method of forming a sand core assembly for a cast component through 3D printing as recited in claim 21 wherein:
Each of the first upper runner and the second upper runner has two ends and an intermediate portion therebetween, the intermediate portion of the first upper runner is connected with the first communication runner, and the intermediate portion of the second upper runner is connected with the second communication runner and the third communication runner.
24. The method of forming a sand core assembly for a cast component through 3D printing as recited in claim 23 wherein:
The step of forming an upper portion by 3D printing also forms one or more vent holes extending upwardly from the cavity and/or the riser and through to an upper surface of the upper portion.
25. The method of forming a sand core assembly for a cast component through 3D printing according to claim 16 wherein:
The upper runner is an upper recess provided in a bottom of the upper portion, the lower runner is a lower recess provided in a top of the lower portion, and a second end of the lower runner at least partially overlaps an end of the upper runner when viewed in a vertical direction.
26. The method of forming a sand core assembly for a cast component through 3D printing according to claim 16 wherein:
Forming the upper portion by 3D printing further includes forming a plurality of through holes in the upper portion, and
Forming the lower portion by 3D printing further includes forming a plurality of through holes in the lower portion.
27. The method of forming a sand core assembly for a cast component through 3D printing as recited in claim 26 wherein:
the plurality of through holes in the upper portion and the plurality of through holes in the lower portion are each formed to be arranged around the cavity.
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